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Cannot create PoolableConnectionFactory

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I have problems with using a database that is available on our remote server.

My code works when I use local database with the settings in Tomcat

<Resource name="jdbc/database" auth="Container" type="javax.sql.DataSource" username="user" password="pass" driverClassName="" url="jdbc:microsoft:sqlserver://localhost:1433;databaseName=database" maxActive="200" maxIdle="100"/>

I can even access all databases on LAN

but when I try accessing remote IP url="jdbc:microsoft:sqlserver://RemoteIP:1433;databaseName=database"

I get this error
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory ([Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.)

Any Ideas.. Do I need to change tomcat settings, or I need to give some permissions on remote SQL server (there are no firewall issues, I checked)

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Tomcat does not need permission to make an external connection so if the problem is indeed how you described, it sounds like a firewall issue. Sorry I couldn't be more helpful than that.
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